<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .imgControler{
  position:relative;
}
.img{
  position:relative;
  width:250px;
}
.controller{
  position:absolute;
  top:-5px;
  left:-5px;
  width:10px;
  height:10px;
  border-radius:50%;
  background-color:white;
  border:1px solid #aaa;
  z-index:50;
}
  </style>
</head>
<body>
  <div class="imgControler">
    <img src="https://img1.baidu.com/it/u=3883901410,74560379&fm=253&fmt=auto&app=138&f=JPEG?w=250&h=334" class="img">
    <div class="controller"></div>
    <div class="controller" transform="translate(20,50)"></div>
  </div>
</body>
</html>